基于相干控制的二能级量子系统退相干抑制  

Decoherence Suppression of Two-level Quantum Systems Based on Coherent Control

作　　者：张靖[1] 李春文[1] 

机构地区：[1]清华大学自动化系,北京100084

出　　处：《控制与决策》2006年第5期508-512,共5页Control and Decision

基　　金：国家自然科学基金项目(60274025;60433050);清华大学基础研究基金项目(200312006)

摘　　要：对于二能级开放量子系统,研究了利用相干控制抑制退相干效应的问题.首先讨论了二能级开放量子系统在相干控制下的建模问题,将退相干抑制归结为与环境噪声解耦的控制问题.然后,引入开环控制抑制退相干,并证明该控制可使系统状态中的部分分量与环境噪声渐近解耦.最后引入反馈控制,使得系统状态的相应分量可以与环境精确解耦,同时能够避免测量引入的量子噪声的影响.The decoherence suppression issue is studied for strategy. The model of two-level open quantum systems two-level quantum systems based on coherent control under coherent control is formulated, in which the decoherence suppression is equivalent to the decoupling problem of the system from envir.onmental noises. Then, an open-loop control is designed to suppress decoherence, which is shown to be capable of asymptotically decoupling a part of the dynamic variables of the system from the environmental noises. Finally, feedback control strategy is introduced so that the corresponding state variables can be precisely decoupled form the environmental noises without being affected by the noises induced by quantum measurement in feedback control.

关 键 词：量子控制 退相干控制 量子反馈控制 

分 类 号：TP13[自动化与计算机技术—控制理论与控制工程]